North of Primorsko in the area between the lagoon Stamopolu and the beach is one of the best preserved dune complexes on our Black Sea coast. The ridges of the highest dunes reach up to 19 m in height and are an exceptional view for visitors. Summer is dry and warm as a result of the cooling influence of the sea, the average temperature in July ranges between 22-23 ° C. The proximity to the relatively warm water masses makes the winter the mildest for the whole country. There are a large number of specific sandy (psammophytic) plant species. More than 80 plant species have been identified on the sands of the dune complexes near Primorsko, 14 of which are included in the Red Book of Bulgaria.

Water Lilies Reserve is known for its large locality of water lilies and snowdrops growing in a forest with a long nature. You enter a specially made wooden bridge, where tourists can admire the beautiful soft white and yellow flowers of water lilies growing in abundance here on large bright green leaves offer an unforgettable view from which the view is difficult to detach. Water Lilies Reserve covers an area of ​​14 ha and covers part of the old riverbed. The road to the marsh Velov vir passes under a shady tunnel of trees and climbing plants. On its waters, hundreds of pale white and yellow flowers of water lilies on large bright green leaves offer an unforgettable view from which the eye is difficult to detach.

Ropotamo Reserve has an area of ​​1,000 ha and stretches around the two banks of the Ropotamo River. The park is inhabited by rare birds, wild boars, deer, deer and others. The Ropotamo Reserve includes several smaller reserves: the Water Lilies Reserve, the Snake Island Reserve, the Arkutino Reserve and the Sea Wormwood Reserve. Several species of cacti are protected in the Snake Island Reserve. There are plenty of birds and snakes. The snake island with an area of ​​10 decares, famous for the cacti in which many birds nest. Snake Island is a small island, also called St. Thomas, to which the chapel located on it was dedicated. According to legend, pirate treasures were buried here. The island is mostly searched and dug up, but it looks like there is nothing left but snakes.

Visiting the Ropotamo Reserve, you will be able to touch the pure and untouched nature, to enjoy its splendor. The flora and fauna include rare and endangered species, making it a natural complex of international importance.

The Devil's River springs from the Strandzha Mountain, passes through the town of Primorsko and flows into the Black Sea in the northern part of the central beach. It receives its waters from the Devil's Swamp, whose level is below sea level. The bay of the same name, which forms the river and the swamp, has estuarine features, bogs, overgrown with reeds and rushes. It is allowed to fish throughout its valley. The Yasna Polyana dam was also built on it.

Arkutino Reserve is a swamp - lagoon, whose vegetation is made of reeds, rushes and white water lilies. Sea Wormwood Reserve is famous for its rich deposit of sea wormwood, which is used in the pharmaceutical industry.
The swamp is part of the Ropotamo Reserve. The swamp is separated from the sea by sand dunes, and a sand lily grows on the beach. The beach opposite the swamp is also called Arkutino.
From the bay there is a beautiful view of the island of St. Thomas - the only place in Bulgaria where you can find wild cacti.

The river is not big, all its beauty comes from the magnificent long forest and beautiful water lilies. Longoz is a stunningly pristine flora. Ropotamo is formed by the rivers Rosenska and Tserovska, springing from Strandzha mountain and has a total length of 50 km. In its upper course the river is freshwater, but after a few kilometers it becomes salty. The shores of Ropotamo are very picturesque. At the beginning, the steep and terraced slopes are wrapped in greenery, under which secluded rocks appear in places. Among them, the most bizarre rock formation is the "Lion's Head". Tall elms, ashes, maples and other trees have intertwined and hung branches over the calm waters. Wild vines, ivy and other climbing plants crawl on them. They create the illusion of an equatorial forest. In its lower reaches, the waters overflow widely and form lush meadows or impassable swamps overgrown with marsh reeds and water lilies. The closer you get to the sea, the shores are surrounded by dense greenery. This is the most beautiful part of the river - the estuary, surrounded by forests, green hills and sand dunes. The river is rich in fish - mullet, ducks, carp, barbel and others.

The lands of the town of Primorsko have been inhabited since ancient times. Numerous finds of ceramic vessels prove that as early as the third century BC. there was a connection with the peoples of Crete, Troy, Egypt and others. This settlement was opened in 2003. and is defined as the earliest Thracian megalithic sanctuary discovered so far in Southeastern Thrace and the Black Sea coast. The discovered material proves that the Sanctuary was visited exclusively by the Thracians. It is associated with the cult of fertility, the Mother Goddess and the Orphic initiation and immortality of the Hero. The large pieces of rock are partially processed by human hands and installed on site, and the stone slabs and blocks are arranged in unique shapes. Stone circles and tubs are carved into the flat rocks. The residential building and the cult hearths complement the evidence of human activity in these lands. The sanctuary is at the highest point above the residence with visibility to the entire bay. It can only be reached by jeep.

The dimensions of the stone, which rests on only two points on another huge stone, are 12 meters high and 9 meters long. He has been here for nearly 5,000 years. And it is only a small part of the two circles - one with 80, the other with 120 meters in diameter, but still not fully disclosed. There are also natural rocks, but most are brought and arranged here. The megalithic sanctuary was used for sacrifices to the sun god. According to archaeologists, the sanctuary was destroyed by the arrival of the first Christians in the year 400.